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diff --git a/external/vpc/public/tier0/validator.h b/external/vpc/public/tier0/validator.h
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+++ b/external/vpc/public/tier0/validator.h
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+//========= Copyright � 1996-2005, Valve Corporation, All rights reserved. ============//
+//
+// Purpose:
+//
+// $NoKeywords: $
+//=============================================================================//
+
+
+#include "valobject.h"
+
+#ifndef VALIDATOR_H
+#define VALIDATOR_H
+
+#ifdef _WIN32
+#pragma once
+#endif
+
+
+#ifdef DBGFLAG_VALIDATE
+
+
+class CValidator
+{
+public:
+	// Constructors & destructors
+	CValidator( void );
+	~CValidator( void );
+
+	// Call this each time we enter a new Validate function
+	void Push( tchar *pchType, void *pvObj, tchar *pchName );
+
+	// Call this each time we exit a Validate function
+	void Pop( void );
+
+	// Claim ownership of a memory block
+	void ClaimMemory( void *pvMem );
+
+	// Finish performing a check and perform necessary computations
+	void Finalize( void );
+
+	// Render our results to the console
+	void RenderObjects( int cubThreshold );	// Render all reported objects
+	void RenderLeaks( void );				// Render all memory leaks
+
+	// List manipulation functions:
+	CValObject *FindObject( void *pvObj );				// Returns CValObject containing pvObj, or NULL.
+	void DiffAgainst( CValidator *pOtherValidator );	// Removes any entries from this validator that are also present in the other.
+
+	// Accessors
+	bool BMemLeaks( void ) { return m_bMemLeaks; };
+	CValObject *PValObjectFirst( void ) { return m_pValObjectFirst; };
+
+	void Validate( CValidator &validator, tchar *pchName );		// Validate our internal structures
+
+
+private:
+	CValObject *m_pValObjectFirst;	// Linked list of all ValObjects
+	CValObject *m_pValObjectLast;	// Last ValObject on the linked list
+
+	CValObject *m_pValObjectCur;	// Object we're current processing
+
+	int m_cpvOwned;		// Total # of blocks owned
+
+	int m_cpubLeaked;	// # of leaked memory blocks
+	int m_cubLeaked;	// Amount of leaked memory
+	bool m_bMemLeaks;	// Has any memory leaked?
+};
+
+
+#endif // DBGFLAG_VALIDATE
+
+
+#endif // VALIDATOR_H